Since such signals are usually too weak to do this, they can be available only to those with very highly sensitized and refined senses or receptors. But THIS topic moves dangerously close to the concept that minds CAN be influenced by invasive psychic signals emanating from others -- and as such clearly touches upon the fear the superpowers of the bio-mind engender. This particular fear was what mostly caused the initial interests of the American intelligence community regarding the mysterious work going on in the Soviet Union -- the possibility of "psychic" mind-control at a distance. And it was in this regard that a "threat analysis" had to be undertaken. However, so feared is this factor regarding subliminal perception that it is almost completely obliterated. For example, IF psychic signals are perceived by the subliminal subconscious, then it would seem that the subliminal processes would be of extraordinary interest to, say, parapsychologists. However, and to my direct knowledge, subliminal perceptions do not figure very importantly anywhere in parapsychology research. Inclusive of these factors, the controversy regarding subliminal perception had raged since about the early 1950s. In my omnivorous reading I had more or less been keeping track of it